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Results of the Adams-Onís Treaty
When the Adams-Onís Treaty comes into force , Florida will go from Spain to the United States, which will forego Texas .
Agia Lavra Monastery, Germanos blesses the flag of the struggle for freedom.  Oil painting by Theodoros Vryzakis, 1865
The Greek War of Independence begins with the oath in the monastery of Agia Lavra .
Fabian Gottlieb von Bellingshausen
Fabian Gottlieb von Bellingshausen discovers Peter I Island .
1821 in other calendars
Armenian calendar 1269/70 (turn of the year July)
Ethiopian calendar 1813/14 (September 10-11)
Bengali solar calendar 1226/27 (beginning of April 14th or 15th)
Buddhist calendar 2364/65 (southern Buddhism); 2363/64 (alternative calculation according to Buddhas Parinirvana )
Chinese calendar 75th (76th) cycle

Year of the Metal Snake辛巳 ( at the beginning of the year Metal Dragon庚辰)

Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam) 1183/84 (turn of the year April)
Dangun era (Korea) 4154/55 (October 2/3)
Iranian calendar 1199/1200
Islamic calendar 1236/1237 (turn of the year 27/28 September)
Jewish calendar 5581/82 (September 26-27)
Coptic Calendar 1537/38 (September 10-11)
Malayalam calendar 996/997
Seleucid era Babylon: 2131/32 (turn of the year April)

Syria: 2132/33 (turn of the year October)

Vikram Sambat (Nepalese Calendar) 1877/78 (April)


Politics and world events

Ljubljana Congress / Kingdom of the Two Sicilies

  • January 19: Great Britain's Foreign Minister declares in a telegram to Prussia, Austria, Russia and France that military interventions in countries threatened with overthrow are not in accordance with British political principles. Great Britain is thus against the Holy Alliance .
Leander Russ, parade to welcome the emperor in Laibach ; Painting 1845
  • January 26th: The Ljubljana Congress begins. Participants are Tsar Alexander I of Russia , Emperor Franz I of Austria and King Ferdinand I of both Sicilies. At the third congress of monarchs , the situation after the coup in the Kingdom of the Two Sicilies is the focus of political deliberations. After the solemn introduction of the new constitution for the Kingdom of the Two Sicilies, King Ferdinand I of Naples-Sicily asks for support for the suppression of the liberal movement. Austria then intervenes militarily in the conflict.
  • March 7th: The Austrian army defeats Neapolitan troops under General Guglielmo Pepe near Rieti . The military intervention in the Kingdom of the Two Sicilies , tolerated by the major European powers, serves to calm the situation after a military coup by the Carbonari the year before and to suppress republican efforts.
  • April 8th: The Austrian troops beat the liberal insurgents in Piedmont and restore the absolutist order. King Ferdinand I repealed the liberal constitution on May 15th.
  • May 12th: The Ljubljana Congress ends with the decision to put down the liberal coup in the Kingdom of the Two Sicilies with a military intervention.

Greek revolution

Flag of Greece during the War of Independence

Other events in Europe

The lavish coronation banquet in Westminster Hall


  • June 13: Egyptian troops conquer the capital Sannar in the Sultanate of Sannar as they advance into neighboring territory . The Egyptians immediately made their military camp Khartoum the new capital. The 300 year old realm of the Fung ceases to exist.

North America

East and West Florida 1810
United States in 1821 after the admission of Missouri

Latin America

José de San Martín



science and technology

Old Konvikt canton school Trogen around 1830


Visual arts

Luther monument

Music and theater

Main article : Music year 1821



January February

Heinrich Barth

March April

Michael Rostock
  • April 21: Michael Rostock , Sorbian botanist and entomologist († 1893)
  • April 26: Robert Adamson , Scottish chemist and photographer († 1848)
  • April 26: Heinrich IV. , Paraglider of Reuss-Köstritz († 1894)
  • April 27: Henry Willis , English organ builder († 1901)

May June

July August

Hermann von Helmholtz

September October

Rudolf Virchow

November December

Fyodor Michailowitsch Dostoevsky, 1863
Gustave Flaubert

Exact date of birth unknown

  • Luigia Abbadia , Italian opera singer († 1896)
  • May: William Kelly Northern Irish classical speaker, Bible interpreter, author and preacher of the Brethren Movement († 1906)


January to April

John Keats' grave (left headstone)
Achard's grave in Moczydlnica Dworska

May to August

Death mask of Napoleon by Francesco Antommarchi
  • 0May 5th: Napoleon Bonaparte , French general, first consul of France, revolutionary dictator and emperor of the French, further co-prince of Andorra, president and king of Italy and protector of the Confederation of the Rhine (* 1769)
  • May 14: Auguste Pidou , Swiss politician (* 1754)
  • May 19: Henri de Franquetot, duc de Coigny , French courtier and general (* 1737)
  • May 26: Constance Mayer , French painter (* 1775)

September to December

Exact date of death unknown

Web links

Commons : 1821  - Collection of Images, Videos, and Audio Files